Crop residue management systems proceedings - Papendick, R. I.,; Mannering, J. V.,; Parr, J. F.,; Lewis, W. M.,; Taylor, H. M.,; Welch, L. F.,; Unger, P.,; Oschwald, W. R.,; Stelly, Matthias,; Kral, David M.,; Nauseef, Judith H., (ASA Special Publication, 1978)